Fuel Pressure Test

Release fuel system pressure. See procedures under FUEL SYSTEM PRESSURE RELEASE . Remove air cleaner from throttle body. Disconnect fuel hose from throttle body.
Install fuel pressure gauge and 3-way connector between fuel feed hose and fuel return hose. See Fig 1 . Install air cleaner. Verify battery voltage is at least 11 volts.

Fig 1: Testing Fuel Pressure
Courtesy of SUZUKI OF AMERICA CORP.
Start engine, warm to normal operating temperature. Observe and record fuel pressure. Compare specifications under all conditions. See FUEL PUMP PERFORMANCE and REGULATED FUEL PRESSURE tables. Turn ignition off. Recheck pressure after one minute.
If pressure is not within specification, check for defective fuel pump, faulty pressure regulator or restriction in fuel system. Repair as required. Release fuel pressure and remove fuel pressure gauge. Reconnect fuel hoses and check for leaks.

FUEL PUMP PERFORMANCE

Application

⁽¹⁾ psi (kg/cm² )

Swift

⁽²⁾ 22.7-29.9 (1.6-2.1)

⁽¹⁾	Key on and engine off.

⁽²⁾	Pressure should maintain at least 12.8 psi (.9 kg/cm² ) for one minute after fuel pump is turned off.

REGULATED FUEL PRESSURE

Application

psi (kg/cm² )

Swift

⁽¹⁾⁽²⁾ 12.8-20.0 (.9-1.4)

⁽¹⁾	With engine idling.

⁽²⁾	Pressure should maintain at least 12.8 psi (.9 kg/cm² ) for one minute after fuel pump is turned off.